DARLING RIVERINE PLAINS BIOREGION Background Report

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16/08/02 Darling Riverine Plains Bioregion Background Report degrees celcius 37 35 33 31 29 27 25 23 21 19 17 15 average daily maximum temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec month Trangie Bourke Walgett Menindee Mungindi Moree Figure 2.12 Mean monthly maximum temperatures (Bureau of Meteorology 2001) degrees celcius 22 20 18 16 14 12 10 8 6 4 2 average daily minimum temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec month Trangie Bourke Walgett Menindee Mungindi Moree Figure 2.13 Mean monthly minimum temperatures (Bureau of Meteorology 2001) 38
16/08/02 Darling Riverine Plains Bioregion Background Report mm 10 8 6 4 2 0 mean daily evaporation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec month Walgett Bourke Figure 2.14 Mean daily evaporation at Walgett and Bourke (Bureau of Meteorology 2001) 2.3 GEOLOGY, TOPOGRAPHY AND SOILS 2.3.1 Geological history The underlying lithology of the bioregion is almost entirely formed from transported sediments. Cainozoic (Quaternary) alluvium is found in 87% of the area and the Cainozoic lacustrine sediments and Cainozoic residual and aeolian sands are present in another 10% of the region. The lacustrine sediments are found along the lower reaches of the Macquarie and Castlereagh Rivers, and the aeolian sands are along the lower reaches of the Darling River with large areas associated with the Menindee overflow lakes. The broad lithology of the bioregion has been mapped (Map 16) and there has also been more detailed geological mapping of some portions of the bioregion. The Great Artesian Basin underlies the DRP bioregion, and this is divided into a series of smaller basins including the Surat and Euromanga Basins. The Great Artesian Basin consists of extensive Quaternary alluvial deposits associated with the Darling River. In a broader context, the entire Barwon-Darling basin can be described as a large intercratonic Cainozoic basin, which has been infilled with sediments derived mainly from continental alluvium (Thoms et al. 1995). In two areas the lithology reflects the underlying geology. In the north of the bioregion the coarse grained Cretaceous Surat Basin sandstone has not been covered by the more recent alluvium, forming the Lightning Ridge and the Collarenebri Interfluves. In areas of rolling downs and lowlands between the Culgoa and Barwon Rivers there are ridges and residuals of various rock types including conglomerate, sandstone, claystone, shale, siltstone, quartzite and granite. The geological history of the Walgett and Nyngan 1:250 000 map sheets, covering an area from Walgett in the north, south to Trangie, west to Girilambone and east to Coonamble, has 39
Page 1 and 2: DARLING RIVERINE PLAINS BIOREGION B
Page 3 and 4: For more information data contact t
Page 5 and 6: 3.2 Vegetation Mapping and Descript
Page 7 and 8: 10 APPENDICES 166 A CLIMATIC DATA B
Page 9 and 10: List of Maps Chapter 1 Map 1 Locati
Page 11 and 12: PROJECT SUMMARY This report forms p
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Initial Phase Assessment Phase 16/0
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Appendix A: Mean Monthly Rainfall a
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80 70 60 50 40 30 20 10 0 25 20 15
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Major Rangetype Rangetype Physiogra
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Appendix C : Native Flora Other Tha
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Family Scientific Name Common Name
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Family Scientific Name cretica Comm
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APPENDIX E: Fauna Other than Those
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Common Name Scientific Name No Reco
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Common 1983 1984 1985 1986 1987 198
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Common Name 1983 1984 1985 1986 198
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Taxa No Records Dataset Class Arach
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Taxa No Records Dataset Family Hebr
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Taxa No Records Dataset Tabanidae s
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Taxa No Records Dataset Berosus sp
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DARLING RIVERINE PLAINS BIOREGION Background Report

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